ELECTRIC FISH SCREEN 



121 



if not entirely eliminated. At the time the screen equipment was disconnected (on 

 August 28), as nearly as could be estimated 500 of the 15,000 fish were in the pro- 

 tected area. These had accumidated gradually during the 10-day period. The 

 screen kept 97 per cent of the fish from the protected area, which is an excellent 

 record. This installation was witnessed by John C. Veatch, of the Oregon Fish 



Fig. 16 



Commission; Edward Balaugh, master fish warden of Oregon; E. F. Averill, master 

 game warden of Oregon; H. B. Holmes, biologist with the United States Bureau 

 of Fisheries; and many others. Eugene Howell, superintendent of the Bonne- 

 ville hatchery, and some of his assistants made daily observations, and J. E. Yates 

 made observations on several different days during the progress of the test. 



